﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.Diagnostics;


// Set Hook: _hookID = SetHook(_proc);
//Delete Hook: UnhookWindowsHookEx(_hookID);

namespace Clipboard
{
    public partial class Form1 : Form
    {

        #region "Constructor"

        public Form1()
        {
            InitializeComponent();
            KeyPressedCallback = new KeyPressedDelegate(KeyPressed);
            _hookID = SetHook(_proc);
        }

        #endregion

        #region Windows function imports

        [DllImport("User32.dll")]
        private static extern short GetAsyncKeyState(System.Windows.Forms.Keys vKey);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr SetWindowsHookEx(int idHook,
            LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        private static extern bool UnhookWindowsHookEx(IntPtr hhk);

        [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode,
            IntPtr wParam, IntPtr lParam);

        [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        private static extern IntPtr GetModuleHandle(string lpModuleName);

        #endregion

        #region "HOOK"

        private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
        private delegate void KeyPressedDelegate(int keyCode);
        private static KeyPressedDelegate KeyPressedCallback;
        private const int WH_KEYBOARD_LL = 13;
        private const int WM_KEYDOWN = 0x0100;
        private static LowLevelKeyboardProc _proc = HookCallback;
        private static IntPtr _hookID = IntPtr.Zero;

        private static IntPtr SetHook(LowLevelKeyboardProc proc)
        {
            using (Process curProcess = Process.GetCurrentProcess())
            using (ProcessModule curModule = curProcess.MainModule)
            {
                return SetWindowsHookEx(WH_KEYBOARD_LL, proc,
                    GetModuleHandle(curModule.ModuleName), 0);
            }
        }

        private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
        {
            if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
            {
                int vkCode = Marshal.ReadInt32(lParam);
                KeyPressedCallback((int)vkCode);
                
            }
            return CallNextHookEx(_hookID, nCode, wParam, lParam);
        }

        #endregion
        
        private void button1_Click(object sender, EventArgs e)
        {
            
        }

        private void KeyPressed(int keyCode)
        {
            if (keyCode == 160)
            {
                int alt = GetAsyncKeyState((Keys)0x18);
                int ctrl = GetAsyncKeyState(Keys.ControlKey);

                if (GetAsyncKeyState(Keys.ControlKey) < -10)
                {
                    if (GetAsyncKeyState(Keys.Alt) < -10)
                    {
                        textBox1.AppendText("BOOOM!!!");
                    }
                }
            }

        }
    }
}
